
const encode = function(input) { 
    let _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";   
    let output = "";  
    let chr1, chr2, chr3, enc1, enc2, enc3, enc4;  
    let i = 0;  
    input = utf8_encode(input);  
    while (i < input.length) {  
        chr1 = input.charCodeAt(i++);  
        chr2 = input.charCodeAt(i++);  
        chr3 = input.charCodeAt(i++);  
        enc1 = chr1 >> 2;  
        enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);  
        enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);  
        enc4 = chr3 & 63;  
        if (isNaN(chr2)) {  
            enc3 = enc4 = 64;  
        } else if (isNaN(chr3)) {  
            enc4 = 64;  
        }  
        output = output +  
        _keyStr.charAt(enc1) + _keyStr.charAt(enc2) +  
        _keyStr.charAt(enc3) + _keyStr.charAt(enc4);  
    }  
    return output;  
}

const utf8_encode = function(input) {  
    input = input.replace(/\r\n/g,"\n");  
    let utftext = "";  
    for (let n = 0; n < input.length; n++) {  
        let c = input.charCodeAt(n);  
        if (c < 128) {  
            utftext += String.fromCharCode(c);  
        } else if((c > 127) && (c < 2048)) {  
            utftext += String.fromCharCode((c >> 6) | 192);  
            utftext += String.fromCharCode((c & 63) | 128);  
        } else {  
            utftext += String.fromCharCode((c >> 12) | 224);  
            utftext += String.fromCharCode(((c >> 6) & 63) | 128);  
            utftext += String.fromCharCode((c & 63) | 128);  
        }  
    }  
    return utftext;  
}

export{
  encode
}